spi: lantiq: Add fifo size bit mask in SoC specific data structure

On newer chipsets, SPI controller has fifos of larger size.
So add the fifo size bit mask entry in SoC specific data structure.

Signed-off-by: Dilip Kota <[email protected]>
Link: https://lore.kernel.org/r/a0889abf17a9fbc7077f10be0f0342b7ebdf9361.1594957019.git.eswara.kota@linux.intel.com
Signed-off-by: Mark Brown <[email protected]>

Author: Dilip Kota

drivers/spi/spi-lantiq-ssc.c

@@ -58,9 +58,7 @@
 #define LTQ_SPI_CLC_DISR	BIT(0)	/* Disable request bit */
 
 #define LTQ_SPI_ID_TXFS_S	24	/* Implemented TX FIFO size */
-#define LTQ_SPI_ID_TXFS_M	(0x3F << LTQ_SPI_ID_TXFS_S)
 #define LTQ_SPI_ID_RXFS_S	16	/* Implemented RX FIFO size */
-#define LTQ_SPI_ID_RXFS_M	(0x3F << LTQ_SPI_ID_RXFS_S)
 #define LTQ_SPI_ID_MOD_S	8	/* Module ID */
 #define LTQ_SPI_ID_MOD_M	(0xff << LTQ_SPI_ID_MOD_S)
 #define LTQ_SPI_ID_CFG_S	5	/* DMA interface support */
@@ -123,19 +121,15 @@
 					 LTQ_SPI_WHBSTATE_CLRTUE)
 
 #define LTQ_SPI_RXFCON_RXFITL_S	8	/* FIFO interrupt trigger level */
-#define LTQ_SPI_RXFCON_RXFITL_M	(0x3F << LTQ_SPI_RXFCON_RXFITL_S)
 #define LTQ_SPI_RXFCON_RXFLU	BIT(1)	/* FIFO flush */
 #define LTQ_SPI_RXFCON_RXFEN	BIT(0)	/* FIFO enable */
 
 #define LTQ_SPI_TXFCON_TXFITL_S	8	/* FIFO interrupt trigger level */
-#define LTQ_SPI_TXFCON_TXFITL_M	(0x3F << LTQ_SPI_TXFCON_TXFITL_S)
 #define LTQ_SPI_TXFCON_TXFLU	BIT(1)	/* FIFO flush */
 #define LTQ_SPI_TXFCON_TXFEN	BIT(0)	/* FIFO enable */
 
 #define LTQ_SPI_FSTAT_RXFFL_S	0
-#define LTQ_SPI_FSTAT_RXFFL_M	(0x3f << LTQ_SPI_FSTAT_RXFFL_S)
 #define LTQ_SPI_FSTAT_TXFFL_S	8
-#define LTQ_SPI_FSTAT_TXFFL_M	(0x3f << LTQ_SPI_FSTAT_TXFFL_S)
 
 #define LTQ_SPI_GPOCON_ISCSBN_S	8
 #define LTQ_SPI_GPOCON_INVOUTN_S	0
@@ -161,6 +155,7 @@ struct lantiq_ssc_hwcfg {
 	unsigned int	irncr;
 	unsigned int	irnicr;
 	bool		irq_ack;
+	u32		fifo_size_mask;
 };
 
 struct lantiq_ssc_spi {
@@ -210,16 +205,18 @@ static void lantiq_ssc_maskl(const struct lantiq_ssc_spi *spi, u32 clr,
 
 static unsigned int tx_fifo_level(const struct lantiq_ssc_spi *spi)
 {
+	const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
 	u32 fstat = lantiq_ssc_readl(spi, LTQ_SPI_FSTAT);
 
-	return (fstat & LTQ_SPI_FSTAT_TXFFL_M) >> LTQ_SPI_FSTAT_TXFFL_S;
+	return (fstat >> LTQ_SPI_FSTAT_TXFFL_S) & hwcfg->fifo_size_mask;
 }
 
 static unsigned int rx_fifo_level(const struct lantiq_ssc_spi *spi)
 {
+	const struct lantiq_ssc_hwcfg *hwcfg = spi->hwcfg;
 	u32 fstat = lantiq_ssc_readl(spi, LTQ_SPI_FSTAT);
 
-	return fstat & LTQ_SPI_FSTAT_RXFFL_M;
+	return (fstat >> LTQ_SPI_FSTAT_RXFFL_S) & hwcfg->fifo_size_mask;
 }
 
 static unsigned int tx_fifo_free(const struct lantiq_ssc_spi *spi)
@@ -807,6 +804,7 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xway = {
 	.irnen_t	= LTQ_SPI_IRNEN_T_XWAY,
 	.irnicr		= 0xF8,
 	.irncr		= 0xFC,
+	.fifo_size_mask	= GENMASK(5, 0),
 	.irq_ack	= false,
 };
 
@@ -815,6 +813,7 @@ static const struct lantiq_ssc_hwcfg lantiq_ssc_xrx = {
 	.irnen_t	= LTQ_SPI_IRNEN_T_XRX,
 	.irnicr		= 0xF8,
 	.irncr		= 0xFC,
+	.fifo_size_mask	= GENMASK(5, 0),
 	.irq_ack	= false,
 };
 
@@ -941,8 +940,8 @@ static int lantiq_ssc_probe(struct platform_device *pdev)
 	INIT_WORK(&spi->work, lantiq_ssc_bussy_work);
 
 	id = lantiq_ssc_readl(spi, LTQ_SPI_ID);
-	spi->tx_fifo_size = (id & LTQ_SPI_ID_TXFS_M) >> LTQ_SPI_ID_TXFS_S;
-	spi->rx_fifo_size = (id & LTQ_SPI_ID_RXFS_M) >> LTQ_SPI_ID_RXFS_S;
+	spi->tx_fifo_size = (id >> LTQ_SPI_ID_TXFS_S) & hwcfg->fifo_size_mask;
+	spi->rx_fifo_size = (id >> LTQ_SPI_ID_RXFS_S) & hwcfg->fifo_size_mask;
 	supports_dma = (id & LTQ_SPI_ID_CFG_M) >> LTQ_SPI_ID_CFG_S;
 	revision = id & LTQ_SPI_ID_REV_M;